Feeding and luting device for metallurgical furnaces



March 3l. 1925.

L. R. KEI-LEY FEEDING AND LUTING DEVICE FOR METALLURGICAL FURNACES FiledNov. 11, 1924 v HTTORNEY WITNESS Patented Mar. 3.1, i925,

UNIT-ED STAT-Es Emre-NT:

Louis n. KELLEY, or `isn inrnsarEM, PENNSYLVANIA, yAssrefnon; Qroi'snrritnrrnivr roUNnaY @LMACHINE COMPANY, A yCo,1a-rena'HON orrENNsYLvAN1a.11.-1

'FEnDrNeANn LUTING Vnrzvvror. ron Maremma-Groar. rrrmurons.`

'Application filed November1lf1924. Serial No. 749,122. i

'Tol @ZZl who/m t may concern.'

Be it known thatl I, Loins R. KELLEY, a. citizen of the United i States,residing lat Bethlehem, -in thei county l of Northampton `and 'StateofPennsylvania, have invented certain new and useful Improvements inYFeeding.anddniting Devices for Metallurgical `fllurnaces,of whichithefollowing is a specification.

The object is to provideiin'ore roasting and other metallurgicalfurnaces,' composed of a'plurality ofsuperimposed hearths-surrounding arotatingshaft, means to 1feed the ore or other material from a-dryingplatform, or frornionehearth, toa-hearth therebelow, which means howeverinsures a gastiglit joint tov prevent the irise of `gases -froin eachroasting chamber.

Another-object isto provide inthis conynection thezcombination of aliearthhaving an enlarged central opening, with a'. shaft extendingthrough and in spaced .relation with the sides .ofsaid opening,

the.inner rings of fire-brick composing the hearth, orlby anannular.channelled metal plate secured to saidheartli, and a so-calledfeed-plate carried by said shaftand provided with a dependingcylindrical flange extendingv into the` ore in saidv groove.

This plate flange is provided at one point with a notclnand with agate,comprising a plane body portion pivotallycarried'by .theplate and havingan angularly depend-v ing portion 'forming a scraper,'the bottom edge ofwhich is just high enough above .the plane of the top surface of thefirebricks to provide clearance. y"With this construction, a furtherobject therefore is to` provide a feeding device which cannotdistuib theore in thelute-groove as it feeds new ore constantly over said `grooveand towards r.the central opening inthe hearth.

Still another object lwhich follows as a natural sequence 'is to providea trap or ygas-tight `joint between the hearth andthe shaft, the firstore in the groove "filling the same about yand in closeA contact withboth sides of the ;plate flange and thus preventing gases froma'lowerhearth passing upwardly through thel central aperture and intoyanupper hearth chamber, except attlie notch inthe flange, which however'Aline'Q--Q of Fig. elevation vof the plate'luteapron .and 4feed,-l agroove formed bythe .shape or..arrangement of .therebeneath, hearths 2passing 'toi thelis constantly choked lvfull y incoming yore as it isimpelled by the'iscrapertthrough said notch. f f

and a Sini farther 'Object-.risse provide' adjustable'` means, extendinginto the .inte- `rior of the rotatable shaftlwhich ishollow,

and pivotally connected with thev gate whereby which ore is lfed fromone.

the presentinvention comprises additional altering -said adjustable,means -varies. :the rate with hearth to a second'hearth 'therebelow r lV Vith `these and other objects rinl view,I

novel details of construction and operation hereinafter fully broughtout inl the yfollowing descriptionwhen read in' conjunction with theaccompanyinghdrawings, in which Fig. l is a vertical diametrical sec-`tion through a portion of a metallurgical furnace of the typehereinbefore referred to; Fig. Qis'a 'fragmentary section on the l;andFlig. 3 is a side ing gate'shown in Figs. land 2.

Referring to the drawings, a furnace ,is

shown as comprising cylindrical sidewalls l, within which is located averticalseries ofsuperimposed hearths and 3, the hearths 2 havingcentral` openings f4: which com# paratively closely surround thelire-brick- `covering 5 of a verticallyextending centrally positionedrotatable shaft '6. The

hearths, onlibe-other hand, arefprovided with comparatively largecentral apertures 7, through which `ore is adapted to pass fromsaid'last-named hearths to the hearths The ore having reached the 'outerperiphf ore lfrom the first-named ,the shaft 6. so that none' ofit willpass outwardly partly by by suitable rabbles ery of this hearth passesthrough the one yor ferred gto.

and fills the channel 10, comprising a socalled lute-groove formed by aseries of sectional channel members secured together m any suitablemanner, Aas for instance by means of radially extending abutting flanges11 (shown in Fig. 2).

Carried vby the shaft 6 is a fee-dplate 12, also formed of segmentalmembers secured j together by radially extending flanges 13,

secured in any suitable manner (as also shown 1n Fig. 2).4 Saidsegmental members therefore lying 1n a common plane and to- .Y gethercomprising' the plate 12 are provided with .depending segmental flanges,which being in annular alignment form a continuous cylindrical flange14, which depends from said plate so that its lower end extends wellinto the lute-groove 10 and considerably below the level or the plane ofthe uppersurfaoe of the fire-brick of the surrounding hearth. While the`shaft revolves and carries with it the feed-plate and depending flange,it will be obviousthat there is a constant gas-tight connection formedby the ore in the lute-groove in conjunction with said flange to preventgases from the vlower hearth passingv upwardly through the opening 7 andinto an upper hearth chamber. So much forthe luting feature of thisimproved construction.

The flange 14 is provided at one point with a notch 15, adjacent towhichis a lug 16. suitably drilled and adapted to receive a pinion-pin17 y which also extends through a lug or boss 18 upon the gate member.This gate member comprises a horizontally extending plane body portion19, slidable upon the'upper surface of the plate 12. An angularlypositioned, downwardly extending scraper portion 20 is adapted to extendlradially outwardly beyond-the circular path l14, and impel ore withwhich it comes into Contact inwardly through the notch 15, the loweredge of the scraper being so positioned as to afford ample clearancewith respect to the adjacent surface of the hearth.

In order to adjust the angular position of i the scraper 20'and therebyregulate the rate with which the ore from the hearth 3 is fed toward theopening 7,a' rod 21 is pivotally connected at 22to the gate and extendsinto the interior of the shaft G, where a suitable hand-wheel or thelike 23 is provided foradjustably positioning said rod radially. Havingeffected the desired adjustment of the feed-gate, the continued motionof the shaft will cause the scraper as it engages the ore to maintainsaid gate in the outermost position permitted by the adjustment of therod.

Howeveiyif it is desired to remove this tension from the rod, the gatemember may be fixed in, any desired position by any suitable means suchforl instance as the bolts which removably secure an upwardly extendingflange 24 carried by the gate with a similarly positioned segmentalflange 25 carried by that plate-segment 12 which is provided with anotch 15.

This construction accordingly provides an efficient feeding device inconjunction `with the luting device hereinbefore described, and of' sucha construction that gases, prevented from rising past the feed-plate,will likewise be prevented from passing through the notch '15, due tothe constant filling or choliing of said notch with ore passingtherethrough under the impelling influence of the kgate scraper 20. v I

Having thus described my invention, what I claim and desire to protectby Letters Pat? ent of the United States is l. In a furnace, thecombination of a hearth having an annular groove, a cylindrical memberhaving alower edge portion revolvable in said groove and having a notch,and a pivotally mounted gate carried by said member, said gatecomprising an upwardly extending scraper portion normally portion andoperative to prevent ore. en-

countered by said scraper lportion from piling against and falling backover said scraper portion.

2. In a furnace, the combination yof a hearth having an annular groove,a cylindrical member having a lower edge vportion revolvable in saidgroove and having a notch. a pivotally mounted gate carried by saidmember, said gate comprising van upwardly extending scraper portionvnormally kpositioned angularly with respect to said member and operativeto impel ore through said notch, and comprising a substantiallyextending portion integral with said first portion and operative toprevent ore encountered by said scrapery portion from piling against andfalling back over said scraperV portion, a hollow shaft to carry saidcylindrical member, a rod pivotally connectedwith said gate andextending into the interior of said shaft, and means to Vmaintain saidrod in adjustable normally fixed positions to maintain the desiredangular positionof the scraper portion of said gate.

3. In a furnace, the combination of a hearth having a-central opening, acircumferentially-positioned series of channelled members togetherproviding an annular grooveadjacent to said opening, a rotatable shaft,a plate carried by said shaft and having a depending cylindrical flangeextending into said groove.

4. In a furnace, the combination of a hearth having a central opening, acircumferentially positioned series of channelled members togetherproviding an annular groove adjacent to said opening, a rotatable shaft,a plate carried by said shaft and having a depending cylindrical flangeextending into said groove, a notch in said flange, and a scraperpivotally carried by said plate and operative upon the rotation of saidshaft to iinpel ore fromi said hearth through said notch and towardssaid opening.

5. In a furnace, the combination of a hearth having a central opening, acircuniferentially positioned series of channelled members togetherproviding an annular groove adjacent to said opening, a rotatable shaft,a plate carried by said shaft and having a depending cylindrical flangeextending into said groove, a notch in said flange, and a gate pivotallycai'ried by said plate and comprising a scraper operative upon therotation of said shaft to iinpel ore from said.

hearth through said notch and towards said opening, and a disclik e bodyportion spanning the distance between the scraper and the plate toprevent ore from escaping and falling back o-ver the scraper.

6. In a metallurgical furnace, the combination of a central shaft, ahearth having a central opening through which ore may drop to a hearthbelow, and provided with an annular channel iron providing an annulargroove adjacent to said opening, a

7. In a metallurgical furnace, the combi-- nation of a central shaft, ahearth having a central opening through which oremay' drop to a hearthbelow, and provided with an annular channel iron. providing an annulargroove adjacent to said opening, a

structure comprising a plate secured to said shaft above the level ofsaid hearth and a depending flange carried by said plate and extendinginto said annular groove and having an opening above the level ofthehearth, and a gate having a plane body portion piv otally carried by andin slidable engagement with said plate and having al dependingangulai'ly extending portion comprising a scraper, operative to feed orethrough the opening in said flange towards the opening in the hearth. yi

In testimonyl whereof I have affixed my signature.

Louis R.' KELLEY.

